Gas flow temperature controller

In a large capacity tangentially fired boiler, the final reheater tubing sustained abnormal oxidation and localized excessive metal wastage in a short time of the unit operation. The root causes of the problem are identified by test data analysis. The test data indicated that the reheater tubing metal temperatures in the affected areas exceeded the recommended limit of the metal oxidation temperature due to higher than expected local gas temperatures and velocities. A soot-blower facing the overheated portion of the reheater leading tubes accelerated the process of metal wastage by periodically removing the oxide layer. The configuration of the boiler internals upstream of the reheater section is found to be the main cause of the localized overheating. Side-to-side gas flow/temperature stratification due to tangential firing contributed to a lesser degree to the problem. The results and conclusions presented in this paper should be a beneficial guide to the designer of large capacity boilers.

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A variable temperature controller for use with a transfer gas flow heating system and powdered samples

Measurement Science and Technology ◽

10.1088/0957-0233/3/9/004 ◽

1992 ◽

Vol 3 (9) ◽

pp. 815-821 ◽

Cited By ~ 2

Author(s):

C H Hansen ◽

P R Milligan ◽

H A Buckmaster

Keyword(s):

Gas Flow ◽

Variable Temperature ◽

Heating System ◽

Temperature Controller

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The Improved Regularized Extreme Learning Machine for the Estimation of Gas Flow Temperature of Blast Furnace

Lecture Notes in Electrical Engineering - Proceedings of 2019 Chinese Intelligent Systems Conference ◽

10.1007/978-981-32-9682-4_30 ◽

2019 ◽

pp. 292-300

Author(s):

Xiaoyang Wu ◽

Sen Zhang ◽

Xiaoli Su ◽

Yixin Yin

Keyword(s):

Blast Furnace ◽

Extreme Learning Machine ◽

Gas Flow ◽

Flow Temperature ◽

Learning Machine

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Numerical Simulation of the Thermodynamic Process of the Molten Salt Furnace

Volume 2: Heat Transfer Enhancement for Practical Applications; Fire and Combustion; Multi-Phase Systems; Heat Transfer in Electronic Equipment; Low Temperature Heat Transfer; Computational Heat Transfer ◽

10.1115/ht2012-58119 ◽

2012 ◽

Author(s):

Lian Ning ◽

Chenn Q. Zhou ◽

Jiemin Zhou

Keyword(s):

Molten Salt ◽

Gas Flow ◽

Radiative Heat ◽

Guide Vane ◽

Furnace Chamber ◽

Air Flow Rate ◽

Thermodynamic Process ◽

Volumetric Concentration ◽

Flow Temperature ◽

Simulation Results

In this paper, a numerical model of the thermodynamic process was developed, by using CFD (software) technique and considering the gas flow, the diffused combustion and the radiative heat transfer in the molten salt furnace. This model aims to optimize the operating parameters. Simulation results demonstrate that the performances of the salt furnace can be improved by optimization. The temperatures along the fire wall circumference are quite even, and the deviant combustion phenomenon is not observed. A back-flow formed in the upper part of the furnace chamber enhances the circulation and the mixing of the gas, helping to effectively stabilize the combustion in the furnace. The behaviors of CO, CO2, NOx and H2O are presented in terms of the gas flow, temperature distribution and volumetric concentration distribution. The furnace with the constant air flow rate of 15500Nm3/h and the angle of guide vane at 48∼50 ° can increase the combustion effectiveness.

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Simulation of the joint effect of rotor-stator interaction and circumferential temperature unevenness on losses in the turbine stage

MATEC Web of Conferences ◽

10.1051/matecconf/201824504006 ◽

2018 ◽

Vol 245 ◽

pp. 04006 ◽

Cited By ~ 1

Author(s):

Nicolay Kortikov

Keyword(s):

Combustion Chamber ◽

Gas Flow ◽

Joint Effect ◽

Turbine Stage ◽

Flow Temperature ◽

Rotating Blades ◽

Rotor Wheel ◽

Air Supply ◽

Rotor Stator Interaction ◽

Unsteady Interaction

The article devotes to problems of unsteady interaction of the hot streams downstream of the combustion chamber with the rotating blades of the rotor wheel. The hot streams downstream of the combustion chamber are caused by discrete circumferentially located fuel nozzles and openings for air supply to the combustion chamber mixing zone. Unsteady interaction of the hot streams with the rotating blades of the rotor wheel leads to local redistribution of the time average gas flow temperature which has effect on the blade – “temperature segregation”.

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Dynamic analysis of nonsteady heat transfer in a fixed bed of spheres at a variable gas-flow temperature

Journal of Engineering Physics ◽

10.1007/bf00827990 ◽

1968 ◽

Vol 14 (2) ◽

pp. 156-158

Author(s):

V. A. Makovskii

Keyword(s):

Heat Transfer ◽

Dynamic Analysis ◽

Gas Flow ◽

Fixed Bed ◽

Flow Temperature ◽

Nonsteady Heat ◽

Nonsteady Heat Transfer

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Efficient reduction of formic acid to formaldehyde by zinc

Canadian Journal of Chemistry ◽

10.1139/cjc-2018-0284 ◽

2019 ◽

Vol 97 (1) ◽

pp. 42-45 ◽

Cited By ~ 1

Author(s):

Nicholas P. Alderman ◽

Virginie Peneau ◽

Camilo J. Viasus ◽

Ilia Korobkov ◽

Balamurugan Vidjayacoumar ◽

...

Keyword(s):

Zinc Oxide ◽

Formic Acid ◽

Gas Flow ◽

Methyl Formate ◽

Metallic Zinc ◽

Secondary Products ◽

Flow Temperature ◽

Low Concentrations ◽

Efficient Reduction ◽

Carrier Gas Flow

The possibility of thermally reducing formic acid to formaldehyde selectively has been probed using metallic zinc. Good selectivity (over 80%) was obtained with low concentrations of formic acid, with methanol and methyl formate as secondary products. The selectivity can be tuned by changing the carrier gas flow, temperature, and zinc amount. Zinc was oxidized to zinc oxide during this process.

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